Jessica Burlew went by 'soultaker11' on a website called Vampire Freaks and Xenia Nex on others. (Facebook)

The girl told cops she used an extension cord to strangle the man before they got it on, but he never used the safe word and passed out. The teen then used a razor blade to cut the man in an attempt to revive him, before cutting him more to "alleviate her stress from the situation," court charging papers recount.

Burlew eventually called her mother to say her older lover, who went by "gothadelic" on social media, was dead.

Jessica Burlew, 16, strangled Jason Ash to death with an electrical cord during a consensual sex act, the teen claims. (Facebook)

But the girl was partaking in very adult situations in her personal life — and in her online alter ego known as Xenia Nex.

In Facebook postings and YouTube clips, Burlew — with dark, heavily applied eye makeup, her hair dyed teal and blue and with piercings through her eyebrows, nose and lip — painted a grim picture of a confused, death-obsessed teen.

Burlew wrote songs with names like "Golden Age of Death" and "Poor Little Victims" and posted videos of her singing the dark lyrics on YouTube.